155553243 has 4 divisors (see below), whose sum is σ = 207404328. Its totient is φ = 103702160.

The previous prime is 155553197. The next prime is 155553269. The reversal of 155553243 is 342355551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155553243 - 2⁸ = 155552987 is a prime.

It is a super-2 number, since 2×155553243² = 48393622815634098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155551243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25925538 + ... + 25925543.

It is an arithmetic number, because the mean of its divisors is an integer number (51851082).

Almost surely, 2^155553243 is an apocalyptic number.

155553243 is a deficient number, since it is larger than the sum of its proper divisors (51851085).

155553243 is an equidigital number, since it uses as much as digits as its factorization.

155553243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51851084.

The product of its digits is 45000, while the sum is 33.

The square root of 155553243 is about 12472.0985804314. The cubic root of 155553243 is about 537.8068835592.

The spelling of 155553243 in words is "one hundred fifty-five million, five hundred fifty-three thousand, two hundred forty-three".